E-T-A 447-S-H-FN-125A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The E-T-A 447-S-H-FN-125A is a thermal-magnetic circuit breaker rated for 125A at 28V DC, designed for chassis mount applications with push-to-reset actuation. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for system maintenance, repair, and new design implementations where this specific model is no longer available through standard distribution channels.

Substiute Parts

447-S-H-FN-125A

E-T-AIn Stock: 887447-S-H-FN-125A Datasheet

Current PartRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 447-S-H-FN-125A requires matching the following critical parameters:

• Current Rating: 125A (exact match required)
• Voltage Rating: 28V DC (exact match required)
• Breaker Type: Thermal Magnetic (functional requirement)
• Mounting Type: Chassis Mount (mechanical requirement)
• Actuator Type: Push to Reset (operational requirement)
• Number of Poles: 1 (circuit configuration requirement)
• Approval Certifications: CSA C22.2 No 235 and/or UL1077 (regulatory compliance)

No substitute parts have been identified with the exact parameter specifications provided. The combination of 125A current rating, 28V DC voltage rating, thermal-magnetic operation, chassis mount configuration, and single-pole design with push-to-reset actuation represents a specific application requirement. Alternative sources should be evaluated based on these exact parameters.

Parameter Comparison

Engineering Selection Recommendations

The 447-S-H-FN-125A carries CSA C22.2 No 235 and UL1077 certifications, establishing compliance for aerospace and industrial applications. Given the obsolete status of this component, replacement selection must prioritize:

1. Exact Parameter Matching: Current rating, voltage rating, and pole configuration must be identical to maintain circuit protection integrity.
2. Certification Alignment: Substitute components must carry equivalent or superior certifications (CSA C22.2 No 235, UL1077, or equivalent standards).
3. Mechanical Compatibility: Chassis mount configuration and push-to-reset actuation must be preserved to ensure installation compatibility.
4. Thermal-Magnetic Operation: The protection mechanism must remain thermal-magnetic to maintain the original trip characteristics.

Frequently Asked Questions (FAQ)

Q: What makes a circuit breaker a valid substitute for the 447-S-H-FN-125A?

A: A valid substitute must match all critical parameters: 125A current rating, 28V DC voltage rating, thermal-magnetic operation, chassis mount configuration, push-to-reset actuation, single-pole design, and carry CSA C22.2 No 235 or UL1077 certification.

Q: Why is the 447-S-H-FN-125A classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. This necessitates sourcing from remaining inventory or identifying functionally equivalent alternatives from current production lines.

Q: Can a different current rating be used as a substitute?

A: No. The 125A current rating is a critical protection parameter. Substituting with a different amperage rating will alter circuit protection characteristics and compromise system safety.

Q: What is the significance of the 28V DC voltage rating?

A: The 28V DC rating specifies the maximum voltage the breaker can safely interrupt. This is a fundamental electrical parameter that cannot be altered without affecting breaker performance and safety compliance.

Q: Are there any packaging considerations for this component?

A: The 447-S-H-FN-125A is supplied as individual units. Packaging specifications were not provided in the technical parameters, so packaging compatibility should be verified during component procurement.